Illumination device



RID. BARNARD.

ILLUMINATION DEVICE. APPLICATION FILEDISEPLZ, 1919.

1,386,982. v Patented Aug. 9, 1921.1

Fla?

, INVENTOR! D BARNARD.

BY M4 TTORNEYS.

1 W s st res] RAY n. BARNARD, oFMINNEAroLIs, iarivlvnsorn,

SSTIGNOR, BY manor AND MESNE I ILLUMINATION nnvIcE.

T 0 all whom it may concern: Y

Be it known that'I, RAY D. BARNARD, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Illumination Devices, of which the following is a specification.

My invention'relates to illumination devices and 'an object is to provide a device of this character which will concentrate the rays of light emanating from a sourceof light and produce a strong illumination over a comparatively limited area underneath the device without shadows in such area. My device is particularly adapted for use by dentists in operating in the mouth of a patient but is well adapted for use in other operations and may be used for illuminating purposes in general;

The full objects and advantages of'my 1nvention will appear'iriconnection with the detailed description thereof and the novel features embodiedin 'myinventive idea will be particularly"pointed out in the claims;

In the accompanying 'draw-i'ngs,--which one form,'-' e 1 I Figure 1 is'a view in vertical section. Fig. 2 is a view in section on the'line'2 -2 of Fig.1 looking in the direction of the arrows.

Referring to the construction shown in the drawings, an upper reflector has an annular curved member 12 provided with a bead 13 at the outer margin, and this curved member, which is concave on its lower side, has its inner margin connected to a flat central member 14. A curved member 16 is provided on its lower end with an annular portion 17. The curved surface of this member 16 forms a continuation of the illustrate the application of myinvention in curved surface of the member 12. It is ob-' reduced upwardly-extending portion screw-.

threaded to receive a nut 20. The upper end of the base portion is curved to fit the lower surface of the member 16 and the nut 20 turns down upon the flat portion 14 to securely hold the two parts together. From Specification of LettersjPatentl I I Patented A g; Application filed September 2, 1919. Serial in). 320,983.

the base portions 18 flexible members '22 extenddownwardly and support a lower bowlllke reflector 24. The upper reflector may be either translucentor opaque and maybe constructed of any suitable material. For convenience in manufacture the member 12 and thecentral member 14 may be constructed of metal spun into the proper shape, and the member 12 has .a reflecting surface formed on the concave side in suitable manner as by a coating of white paint. The member 16 may be spun from metal and may have a polished reflecting surface on its concave side or it may be formed of glass which is provided with a mirror-like coating. The

earawr oFFic E.

lower reflector '24 is preferably formed of translucent glass the'inner surface of which is smooth to constitute a good reflector and the outer surface of which is ground or otherwise roughened to disperse the light which passes through. A suitable source of light such as an electric filament lamp 26 is I v placed within the upper portion of the bowl 24. When a-filament lamp is employed it IS positioned so that the "filament-is some what below the'rim of the bowl for a purpose which will presently appear." The lamp 26 is screwed into the customary socket 28 which issecured to the flat member 14 by bolts 30 which are surrounded by spacing rings 32 in order that the lamp may be properly positioned relatively to the bowl so as to give the best results. The device may be supported from the ceiling in the usual manner by a chain 34 attached at its lower end to a bolt 36 which extends through the fiat member 14 and has a nut38 threaded onits lower end. A cup-shaped member" 40. is

flat member 14. Wires 42 and 44 serve to supply and conduct away an electric current i for incandescing the filament ofthe lamp 26.

The'operation and advantages of my invention may now be readily understood. One of the important features'is that the upper and lower reflectors and the filament are all positioned relatively to each other in such manner that it is impossible to obtain a direct ray of light from the filament in any position outside of the device. In other words, a person whose eyes are in any POSl: tion outside the reflectors is unable to see the fllament'unless it may be through a small ventilating. opening in the bottom of V the bowl which is sometimes provided. i

I claim:

1. An illumination device comprising an upper member consisting of an annular portion and a central portion, said annular portion being-concaved on its lower surface to form a reflector, and said central portion bridging the space within the inner circular margin of said annular portion, means attached to said central portion and depending therefrom for supporting a lamp, a hollow inwardly concaved reflecting member whose outer surface is adapted to form a continuation of the lower surface of said annular portion, a light diffusing bowl within which a lamp is adapted to be supported, and means for supporting said hollow member and said bowl from said central portion.

2. An illumination device comprising an upper member consisting of an annular portion and a central portion, said annular portion being concaved on its lower surface to form a reflector and said central portion bridging the space within the inner circular margin of said annular portion, means attached to said central portion for suspending said upper member, means attached to said central member and depending therefrom for supporting a lamp, a hollow inwardly concaved reflecting member whose outer surface is adapted to form a continuation of the lower surface of said annular portion, a light diffusing bowl within which the lamp is adapted to be supported,and means for supporting said hollow member and said bowl from said central portion.

8. An illumination device comprising an upper member, consisting of an annular por tion and a flat horizontal portion, said annular portion being concaved on its lower surface to form a reflector and said horizontal portion bridging the space within the inner circular margin of said annular portion, means attached to the center'of said horizontal portion for suspending said upper member, means attached to said horizontal portion and depending therefrom for supporting a lamp, a hollow inwardly concaved reflecting member whose outer surface is adapted to form a continuation of the lower surface of said annular portion, said hollow member curving inwardly and downwardly toward the lamp when the latter is in place, a light diffusing bowl within which the lamp is adapted to be supported, and means for supporting said hollow member and said bowl from said horizontal portion.

LAn illumination device comprising an 1 hollow member curving inwardly and down- V wardly toward the lamp when the latter is in place, alight diffusing bowl within which the lamp is adapted to be supported, fastening members attached to said horizontal portion, said fastening members having curved base portions for supporting said hollow member, and members depending from said base portions for supporting said bowl.

In testimony whereof I hereunto afiix my signature.

RAY D. BARNARD. 

